热液羽状流模型的建立与仿真

Modeling and Simulation of Hydrothermal Plume Model

构建符合实际海洋环境的热液羽状流模型一直是进行水下机器人追踪探测研究的首要问题。目前应用的模型都比较单一,无法准确全面的描述羽状流特性,为了解决上述问题,提出利用一方程模型和细丝模型相结合的方法建立离散热液羽状流仿真模型。模型考虑了湍流对热液羽状流的影响,利用一方程模型对雷诺方程进行流场求解,并利用细丝模型对羽状物化学浓度以及细丝的变化进行计算。利用所建模型对热液羽状流进行仿真,结果显示,上述模型可以很好的模拟出热液羽状流输运过程中的复杂形态,以及羽状物化学浓度的分布规律。对仿真结果进行数值分析后表明,上述模型在时间平均浓度分布以及瞬时浓度随时间变化等方面与实验结果相一致,充分验证了热液羽状流模型的合理性,并且为水下机器人进行追踪探测研究提供支持。

A modeling method combined one-equation model with filament-model is presented to establish the discrete hydrothermal plume simulation model, which considers the influence of turbulence on the hydrothermal plume flow. The RANS equations are solved by using the one-equation model, and the plume concentration and filament changes are calculated by using the filament-model. The hydrothermal plume model is simulated, and the simulation results show that the model can simulate the complex transport shape of plume, and the concentration of chemical plume distribution. The analysis of the numerical simulation results show that the model in terms of the time-averaged concentration distribution and instantaneous concentration change over time are consistent with the previous experi- mental results, which can provid support for AUV tracing and detection.